The u.rat: switching vs stepping

The one thing I really don’t like about the u.RAT is how slow it is to turn the roller inductor. I also noticed that you start wearing down the wire on the roller.

One answer would be to use a relay board. You could switch in taps of a fixed inductor, and use the switches on the KPOD to control which tap you want. 

In fact, you could do the same thing with doorknob caps, but the variable capacitor that I have tunes nicely with a stepper motor, and with no wear or tear on the component as there is with the roller inductor.

3 Comments on “The u.rat: switching vs stepping

  1. Yeah, I was going to use a stepper motor to adjust the settings on that K9AY loop controller I got from you. But in the end, I just decided to rip out the rotary switches and use an Arduino controlled relay board instead. A much more robust solution.

    In your case, the question is whether the relays can handle the voltage/current, I suppose. I had the advantage of only needing to switch control signals.


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